Share 'fiction or non-fiction'

Ok, so it goes without saying that I think the Bible, the Koran, the Torah, and all other religious books should be considered fiction. Now, how the hell do I convince others of this?
We were having a discussion at work (i am a teacher) about fiction and non-fiction. A student asked a teacher if the bible was fiction or non-fiction. The teacher said the student should ask his parent. I though…